For centuries, the source of the mighty River Nile was shrouded in mystery in the dark heart of Africa. In Roman times, the phrase caput Nili quærere, “to search for the head of the Nile”, was used as a metaphor for any foolish or impossible endeavour, and many explorers tried and failed to reach the fabled “Mountains of the Moon” from which the river emerged. Nowadays, thanks to Google, we can explore the whole river from our desktop, without even having to get dressed. The Nile, of course, is not a single river. It is formed from two…